Modifying the stock airbox - a discussion - Mercedes Benz SLK Forum

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#1 Old 06-13-2014
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Modifying the stock airbox - a discussion

I've been debating between switching to (and modifying) the E55 airbox or just modifying the stock SLK55 airbox. The Kleemann supercharger kit actually uses the E55 airbox. However, I prefer the look of the SLK55 airbox with the AMG emblems and the creator name plate. It just looks good the way it is. Even if you get the E55 front cover, it looks like something is missing.

Using the Renntech (and Black Series) airbox as inspiration, I'd like to perform similar modifications to my stock airbox. I believe the Renntech has the following modifications:

-only the top part of the airbox is covered in CF (outside and inside)
-all baffles have been removed
-airbox has been modified to be about an inch taller

The Black Series airbox has a small bottom section (and throttle body) covered in CF. Am I missing anything?

-edit: BS airbox has the throttle body screen on the airbox removed

I'm thinking of removing all the baffles from my stock intake and covering the airbox from top to bottom in heat-reflective material, possibly on the inside as well. Any ideas or suggestions?


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Last edited by jameslk55; 07-03-2014 at 11:27 PM.
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#2 Old 06-15-2014
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This is purely a subjective thing, no?
My personal take is that the AMG logo is now too prolific - apart from the higher proportion of MB cars going out as AMGs, then take the lads who buy AMG badged wheels and plaster their cars as AMG, then its all over the instrument dials, the seats, the mats, gear lever knob and so it goes on.
I take it that you are actually installing a Kleeman s/c, yes?
Exposing the engine bay of an AMG variant just shows a plastic slab like something out of Star Wars, with a huge AMG logo blasted across it, but it does not show anything of the might of the engine beneath.
I, and it is personal, prefer the more subdued look. Looking into an engine bay and seeing a well designed V8 with the simple 'KLEEMAN V8' logo along the charger casting, evokes a lot more emotion for me...
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#3 Old 06-15-2014
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James,

I would consider something like THIS from Carbonio in Canada!

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#4 Old 06-15-2014
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Quote:
Originally Posted by Hal Adams View Post
This is purely a subjective thing, no?
My personal take is that the AMG logo is now too prolific - apart from the higher proportion of MB cars going out as AMGs, then take the lads who buy AMG badged wheels and plaster their cars as AMG, then its all over the instrument dials, the seats, the mats, gear lever knob and so it goes on.
I take it that you are actually installing a Kleeman s/c, yes?
Exposing the engine bay of an AMG variant just shows a plastic slab like something out of Star Wars, with a huge AMG logo blasted across it, but it does not show anything of the might of the engine beneath.
I, and it is personal, prefer the more subdued look. Looking into an engine bay and seeing a well designed V8 with the simple 'KLEEMAN V8' logo along the charger casting, evokes a lot more emotion for me...
As much as I'd love to have the Kleemann s/c installed, I have no plans to get it at this time... My intention of the post was to try and figure out a balance between form and function (squeezing out a little more power). Some folks claim more power was gained from the E55 airbox. I've seen a thread where the Renntech airbox made more power than the E55 airbox. These tests were not done on an actual SLK55. It's not about the "AMG" logo, it's about the engine bay looking "ghetto."


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#5 Old 06-15-2014
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Quote:
Originally Posted by Stinger View Post
James,

I would consider something like THIS from Carbonio in Canada!
I have seen that intake during my research. What turns me off about the Renntech and Carbonio airboxes are that only the top parts are covered in CF. I'm not sure if it helps but wouldn't it be more beneficial if the stock bottom parts of the intakes were covered? There's also the option of getting the NeedsWings intake but the price seems a bit excessive for what is offered.

Picture of Renntech, baffle-free:



I believe the E55 airboxes are baffle-free, correct?


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#6 Old 06-16-2014
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Quote:
Originally Posted by jameslk55 View Post
As much as I'd love to have the Kleemann s/c installed, I have no plans to get it at this time... My intention of the post was to try and figure out a balance between form and function (squeezing out a little more power). Some folks claim more power was gained from the E55 airbox. I've seen a thread where the Renntech airbox made more power than the E55 airbox. These tests were not done on an actual SLK55. It's not about the "AMG" logo, it's about the engine bay looking "ghetto."
Ah, OK, this changes things somewhat! Yes, I would prefer something like the Renntech if I did not have a Kleeman blower to show off!
But, a question: Surely with a 55, you would not even notice any power increase, if any were possible, from modifying the air box?? It would hardly be a nano second on the figures imo!
What do you mean by 'ghetto'?
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#7 Old 06-16-2014
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The carbon fiber is for looks. It's not on the bottom so what heat is it blocking? I would put the intake I made up against any of them on the dyno. I was thinking of cutting my stock airbox up just to fit the inside cover piece.
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#8 Old 06-19-2014
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Originally Posted by CLyons0203 View Post
The carbon fiber is for looks. It's not on the bottom so what heat is it blocking? I would put the intake I made up against any of them on the dyno. I was thinking of cutting my stock airbox up just to fit the inside cover piece.
Is carbon fiber even that great as a heat shield barrier? There seems to be a few cheaper heat-shielding materials on the market.


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#9 Old 07-06-2014
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I also have been thinking along the same lines, my thought was to make my own CAI and ran across this thread on another forum.

http://mbworld.org/forums/c32-amg-c5...lks-doing.html

Modifying the existing airbox does seem more sanitary. It would be interesting to compare on a flow bench, that is if I had one...
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#10 Old 07-07-2014
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Originally Posted by Lioninstreet View Post
I also have been thinking along the same lines, my thought was to make my own CAI and ran across this thread on another forum.

http://mbworld.org/forums/c32-amg-c5...lks-doing.html

Modifying the existing airbox does seem more sanitary. It would be interesting to compare on a flow bench, that is if I had one...


https://www.slkworld.com/performance-...ake-setup.html

CLyons0203 made his own CAI. Modifying the existing airbox would've required a lot of work to remove the air baffles. There are more baffles and open space in the center of the stock airbox, which would require some serious modification to access that area. I decided to go with the E55 setup instead. I guess I can always switch back to stock if necessary.


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#11 Old 07-07-2014
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Why not NeedsWings cold air intake setup? Looks very nice, and I had nothing but incredible gains from every product I ever purchased from them.
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#12 Old 07-08-2014
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Originally Posted by Boris_Balkan View Post
Why not NeedsWings cold air intake setup? Looks very nice, and I had nothing but incredible gains from every product I ever purchased from them.
$850 (on sale for $800) plus shipping costs is more than I want to spend on an air intake system. What's the gain on the SLK55, switching from stock to the NeedsWings intake?


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#13 Old 07-08-2014
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Quote:
Originally Posted by jameslk55 View Post
$850 (on sale for $800) plus shipping costs is more than I want to spend on an air intake system. What's the gain on the SLK55, switching from stock to the NeedsWings intake?
I was thinking the same thing about the Needswings setup. It sure is pretty and according to their CFM data it outflows an un-modified stock box by quite a bit.

But from the threads on this and other forums there seems to be far more result with a CAI on a blown motor than on a N/A motor, meaning the N/A motor's stock air box restriction is not as bad. This would also explain why AMG only upgraded the box on the Black Series instead of going with something more radical.

IMHO, on the 55 there is probably more bank for the buck by putting the same $850 towards a ECU mod, modifying the airbox box (or making a DCAI like pictured above), and having an X-Pipe installed. That should likely bump the motor output something like 9%-11%.

If anyone has more experience than I on this please chime in.

After that it's prolly time to start counting out the Benjamin's if you expect to see any real measurable improvements on the 'ol butt dyno.
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#14 Old 07-09-2014
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Originally Posted by Lioninstreet View Post
I was thinking the same thing about the Needswings setup. It sure is pretty and according to their CFM data it outflows an un-modified stock box by quite a bit.
If they did a before and after dyno comparison, using an actual R171 SLK55, maybe I could justify spending the money. I'm not sure I've seen any concrete numbers on how much power is gained?


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#15 Old 07-09-2014
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I did find this link https://www.slkworld.com/performance-...html#post79559 on the K&N with the 55 airbox vs the E55k airbox with K&N's modified by VRP.

You might remember this thread from last year.

I also seem to remember seeing a Needswings CFM flow chart comparison showing their setup would easily outflow what it was compared against by quite a good margin. But I didn't bookmark the link..

As I mentioned in another thread, the intake box doesn't seem to be a huge bottleneck on the N/A 55 motor, so 3%-4% gains are all that would be expected. And I know I might make enemy's for saying this but it could be that without a blower, the $850 Needswings setup could be overkill...

My question is, were the gains shown by the E55k box done without any ECU mods? Or was there some smoke and mirrors going on...
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#16 Old 02-15-2015
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Has anyone deleted the secondary air filters in the 55 when installing the Green or K&N filters? Looks like they inhibit air flow to some degree. I would guess that the Greens or K&Ns would filter enough to make the secondary filters redundant.
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#17 Old 02-15-2015
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Also depends on one's state motor vehicle inspection requirements on whether 1 or both cats can legally be removed besides CELs removing the 1st set.
Florida has not had emissions checks for 30 years


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#18 Old 02-15-2015
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The point about emissions control concerns is well taken. Also, depending on the set up some K&N filters can cause problems for your mass air flow (MA sensors. My Kleemann s/c system uses OEM air filters.
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#19 Old 02-15-2015
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Thought this thread was dead...

Any more input on the stock airbox mod VS something home brewed?
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